/* CSS Variables for consistent theming */
:root {
    --primary-color: #7868E6;
    --secondary-color: #B8B5FF;
    --accent-color: #FFB4B4;
    --background-light: #EDEEF7;
    --background-accent: #E4FBFF;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* Device Bar Heights - Detectados automaticamente */
    --statusbar-height: 28px;
    --actionbar-height: 45px;
    
    /* Safe Area Insets - Para dispositivos com notch/gesture */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--background-light);
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(184, 181, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(228, 251, 255, 0.1) 0%, transparent 50%);
    min-height: 100vh;
    position: relative;
}

/* Paper Texture Effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.1) 2px,
            rgba(255, 255, 255, 0.1) 4px
        );
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Device Status Bar (Top) */
.device-statusbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--statusbar-height);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    z-index: 9999;
    pointer-events: none;
}

/* Device Action Bar (Bottom) */
.device-actionbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--actionbar-height);
    background: var(--white);
    z-index: 9998;
    pointer-events: none;
    border-top: 1px solid rgba(120, 104, 230, 0.1);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    box-shadow: var(--shadow);
    margin-top: var(--statusbar-height);
}

.header__logo {
    max-width: 180px;
    height: auto;
    margin: 0 auto 0.8rem;
    display: block;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
    transition: var(--transition);
}

.header__logo:hover {
    transform: scale(1.05);
    filter: drop-shadow(2px 4px 8px rgba(0, 0, 0, 0.3));
}

.header__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header__subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
.main {
    padding: 2rem 0;
    margin-bottom: calc(80px + var(--actionbar-height)); /* Add space for bottom nav + action bar */
}

/* Calculator Section */
.calculator {
    margin-bottom: 2rem;
}

.calculator__card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(184, 181, 255, 0.2);
}

.calculator__title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.calculator__form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group__label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.form-group__input,
.form-group__select {
    padding: 0.75rem;
    border: 2px solid var(--background-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form-group__input:focus,
.form-group__select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(120, 104, 230, 0.1);
}

.form-group__help {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.calculator__button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
}

.calculator__button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(120, 104, 230, 0.3);
}

.calculator__button:active {
    transform: translateY(0);
}

/* Results Section */
.results {
    margin-bottom: 2rem;
}

.results__card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(184, 181, 255, 0.2);
}

.results__title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.results__summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-item {
    background: var(--background-accent);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid rgba(228, 251, 255, 0.5);
}

.summary-item__value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.summary-item__label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.results__chart {
    margin-bottom: 2rem;
    text-align: center;
}

.results__timeline {
    background: var(--background-light);
    padding: 1.5rem;
    border-radius: 8px;
}

.timeline-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    margin-bottom: 1rem;
    background: var(--white);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.timeline-item__period {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 100px;
}

.timeline-item__probability {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-left: 1rem;
}

/* Tips Section */
.tips {
    margin-bottom: 2rem;
}

.tips__card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(184, 181, 255, 0.2);
}

.tips__title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.tips__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.tip-item {
    background: var(--background-accent);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid rgba(228, 251, 255, 0.5);
}

.tip-item__icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.tip-item__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tip-item__description {
    color: var(--text-dark);
    line-height: 1.5;
}

/* FAQ Section */
.faq {
    margin-bottom: 2rem;
}

.faq__card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(184, 181, 255, 0.2);
}

.faq__title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.faq__item {
    border-bottom: 1px solid var(--background-light);
    margin-bottom: 1rem;
}

.faq__question {
    width: 100%;
    padding: 1rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.faq__question:hover {
    color: var(--primary-color);
}

.faq__question::after {
    content: '+';
    position: absolute;
    right: 1rem;
    font-size: 1.5rem;
    transition: var(--transition);
}

.faq__question[aria-expanded="true"]::after {
    transform: rotate(45deg);
}

.faq__answer {
    padding: 0 1rem 1rem 1rem;
    display: none;
    color: var(--text-dark);
    line-height: 1.6;
}

.faq__answer.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Bottom Navigation Bar */
.bottom-nav {
    position: fixed;
    bottom: var(--actionbar-height);
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0.5rem 0;
    z-index: 100;
    border-top: 1px solid rgba(120, 104, 230, 0.1);
    margin-bottom: 15px;
}

.bottom-nav__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-light);
    min-width: 70px;
    position: relative;
}

.bottom-nav__item:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.bottom-nav__item.active {
    color: var(--primary-color);
}

.bottom-nav__item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 0 0 3px 3px;
}

.bottom-nav__icon {
    width: 24px;
    height: 24px;
    margin-bottom: 0.25rem;
    stroke-width: 2;
}

.bottom-nav__label {
    font-size: 0.7rem;
    font-weight: 500;
    white-space: nowrap;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
    padding-bottom: calc(60px + var(--actionbar-height)); /* Space for bottom nav + action bar */
    margin-bottom: 100px;
}

.footer__text {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    display: none;
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: var(--white);
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header {
        padding: 1.5rem 0;
    }
    
    .header__logo {
        max-width: 120px;
        margin-bottom: 0.75rem;
    }
    
    .header__title {
        font-size: 1.9rem;
        margin-bottom: 0.4rem;
    }
    
    .header__subtitle {
        font-size: 1rem;
    }
    
    .calculator__card,
    .results__card,
    .tips__card,
    .faq__card {
        padding: 1.5rem;
    }
    
    .results {
        margin-bottom: 1.5rem;
    }
    
    .results__title {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .results__summary {
        grid-template-columns: 1fr;
        gap: 0.8rem;
        margin-bottom: 1.5rem;
    }
    
    .summary-item {
        padding: 1rem;
    }
    
    .results__chart {
        margin-bottom: 1.5rem;
    }
    
    .results__timeline {
        padding: 1rem;
    }
    
    .tips__grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-item {
        flex-direction: column;
        text-align: center;
        padding: 0.8rem;
        margin-bottom: 0.8rem;
    }
    
    .timeline-item__probability {
        margin-left: 0;
        margin-top: 0.5rem;
    }
    
    .bottom-nav__item {
        padding: 0.4rem 0.5rem;
        min-width: 60px;
    }
    
    .bottom-nav__label {
        font-size: 0.65rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1.2rem 0;
    }
    
    .header__logo {
        max-width: 100px;
        margin-bottom: 0.5rem;
    }
    
    .header__title {
        font-size: 1.6rem;
        margin-bottom: 0.3rem;
    }
    
    .header__subtitle {
        font-size: 0.9rem;
        line-height: 1.4;
    }
    
    .main {
        padding: 1.5rem 0;
    }
    
    .calculator,
    .results,
    .tips,
    .faq {
        margin-bottom: 1rem;
    }
    
    .calculator__card,
    .results__card,
    .tips__card,
    .faq__card {
        padding: 1rem;
    }
    
    .results__title {
        font-size: 1.4rem;
        margin-bottom: 1rem;
    }
    
    .results__summary {
        gap: 0.75rem;
        margin-bottom: 1rem;
    }
    
    .summary-item {
        padding: 0.8rem;
    }
    
    .summary-item__value {
        font-size: 1.5rem;
    }
    
    .summary-item__label {
        font-size: 0.85rem;
    }
    
    .results__chart {
        margin-bottom: 1rem;
    }
    
    .results__chart canvas {
        max-height: 180px;
    }
    
    .results__timeline {
        padding: 0.8rem;
    }
    
    .timeline-item {
        padding: 0.75rem;
        margin-bottom: 0.6rem;
    }
    
    .timeline-item__period {
        font-size: 0.9rem;
        min-width: auto;
    }
    
    .timeline-item__probability {
        font-size: 1.1rem;
    }
    
    .bottom-nav__item {
        padding: 0.3rem 0.3rem;
        min-width: 50px;
    }
    
    .bottom-nav__icon {
        width: 20px;
        height: 20px;
    }
    
    .bottom-nav__label {
        font-size: 0.6rem;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000080;
        --secondary-color: #000060;
        --text-dark: #000000;
        --text-light: #333333;
    }
}

/* Focus styles for better accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}